I have a late 2011 Macbook pro, and lately it hasn't been sleeping properly. If I close the lid for less than a minute and reopen it, it doesn't go to sleep while the lid is closed. The screen is still displayed immediately after reopening. Also, a few seconds after I open the machine, it will go to sleep on it's own. I have had the software checked and that doesn't seem to be the problem. What could be causing this and how do I get it fixed? It is still under warranty.

Same problem here: my MacBook Air from 2012 (OS X 10.7.5) doesen't go to sleep at closing the lid. I disabled "Dropbox Lan Sync" and checked if it has enough free harddrive space. still the same. It goes to sleep, if I don't close the lid after exactly 1 Minute not working on it (like I set in in energy-options). But not, if I close the lid: Then even the screen stays on, while the lid is closed. Sometimes it goes to sleep after some Minutes with lid closed (always more than 1 minute) but sometimes not. What do I have to look for on the console? in which log there would be a hint on what is ha
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rubo77Oct 8 '12 at 9:30

3 Answers
3

If there is a process that is preventing sleep (rather than a bug in the sleep implementation), you can use "pmset -g" in a terminal window to list the process that is doing that. This is covered over on superuser.

Here is an an example on my system. First, with nothing preventing sleep: